Guardianes de la Ciudadela
Guardianes de la Ciudadela is one of the best book sagas I've ever read. I'm not going to translate the tittle to English because it will probably be worst. Well, this saga is made up of three books → 1. El Bestiario de Axlin, 2. El secreto de Xein and 3. La misión de Rox.
The main characters are Axlin and Xein, but there are also some secondary characters that I like, for example Yarlax and Dex. I know what you are wondering right now, why so many Xs. Well, I don't know exactly the reason, but it makes the book itself so much better.
Basically the story is starred by Axlin, whose village has been destroyed by the monsters. From that moment on, she has the need of travelling to the Ciudadela to get some answers about the monsters and to get to know them better. Meanwhile, on her way to the Ciudadela she meets lots of people. Xein. But he has a singularity, he has gold eyes, a strange characteristic that only a few people have the luck of have. While Axlin is gone in the Ciudadela, Xein is recluted by the guardians against his will in his village. When Axlin comes back for Xein, she discovers that he's gone and from that moment on, Axlin will have to make herself confortable in the Ciudadela to get some answers for discovering where Xein is, but she always will be gaining facts about monsters and writing about them on her bestiary.
As you can see, the plot is awesome and the story told as well. I liked it very much and it's so adictive, once you have started to read it, you may have problems to stop. I hope you give them a chance, it's worth it.
María Garrido